Check that the node has a parent before matching a 'child' selector #138
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The child selector can try to match the left subselector to an undefined node when the right subselector matches to a top-level (i.e. parentless) node.
This pull request addresses that issue and adds a regression test.
This fixes the crash from issue #135 on my setup when running ESLint with eslint-config-standard, as well as with the @typescript-eslint/require-await rule enabled. It might still be a good idea to consider merging #136 or #137 as well.